Huang was part of a 2000 study, cited in the National Research Council report on global warming, which showed that the 20th century was the warmest of the last five centuries. Now, the temperature increase has been found to permeate subsurface rock.

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How can a couple of degrees of average extra heat transfer though all that rock and effect core temperatures (thousands of degrees) at all? It’s like adding a drop of boiling water to a glacier; it’s not gonna have any real effect.

Besides, isn’t the crust deeper than “600 feet of rocks”? The heat isn’t permeating very deep compared to the actual depth of the Earth.